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All Journal Indonesian Journal of Applied Sciences Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
Ediar Usman
Pusat Penelitian dan Pengembangan Geologi Kelautan
Chemistry Earth & Planetary Sciences Energy Environmental Science

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TEKTONIK DAN JALUR VULKANIK BUSUR BELAKANG BAWEANMURIA SEBAGAI PENGONTROL PEMBENTUKAN CEKUNGAN PATI DAN POTENSI HIDROKARBON Ediar Usman
Indonesian Journal of Applied Sciences Vol 2, No 3 (2012)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (396.971 KB) | DOI: 10.24198/ijas.v2i3.2744

Abstract

are situated on the southeast border of the granite chalk belt of L. Jawa, and increasingly far from the recent subduction. From interpretation of seismic data of Pre-Tertiary rocks and Palaeogene and Neogene sediment, a tectonic direction was obtained, of the same direction as the Muria – Bawean back arc volcanic belt, namely Southwest – Northeast, or what is known as Pola Meratus. The development of the Palaeogene and Neogene tectonic in line with the aforementioned Plistosen-Holosen volcanic belt, points to the research area as an unstable tectonic and volcanically active from Palaeogene to Holosen. Other evidence of the Muria – Bawean back arc volcanic belt is the chemical composition of the five volcanic rock samples in area G. Muria shows genesis of Calc-Alkaline-Shoshonite magma. Total alkaline content is roughly between 3,08 - 13,92% including in the Andesit – Dasit group, and SiO2 is between 59 – 69,82% characterised medium-acidic. Results of microscopic analysis of the five rock samples show plagioclase mineral content, K-feldspar, hornblende, firoksen and glass dominant in all samples. Fomation of the aforementioned Palaeogene-Neogene (Pola Meratus) tectonic and Muria – Bawean back arc volcanic belt split the East JavaNorth basin in two, namely Pati Basin in the West and East Java North Basin in te East. The aforementioned tectonic and volcanic influence caused sub-basin orientation at Pati Basin and the East Java North Basin heading Southwest – Northeast. This condition has led to a new understanding of basin formatin and sub-basin orientation. Basic formation of a basin and sub-basin is not only based on the process of Palaeogene geology, but influenced by Neogene volcanism and tectonics. Similarities in the tectonic, volcanic and historical process of the formation of Pati Basin and the East Java North Basin show that the two basins have a petroleum system and the same prospectively high hydrocarbon content, so that if a more detailed exploration of Pati Basin is undertaken, it is predicted that hydrocarbon will be obtainable, as at the East Java North Basin, which is currently in production.
PROSES SEDIMENTASI DASAR LAUT DI TELUK KUMAI, KALIMANTAN TENGAH, DAN HUBUNGANNYA DENGAN CEBAKAN EMAS DAN PERAK Ediar Usman; Imelda R.Silalahi
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 4 (2009): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i4.211

Abstract

Results of analysis of gold and silver contents within the sea floor sediments in the Kumai Bay show that the highest contents are at the location of TPL-43, TPL-44, TPL-54, TPL-74 and TPL-75 locations with ranging from 0,09 to 0,19 ppm for gold and 1,6 to 3,75 ppm for silver. A curve showing the relationship between grain size and percentage of grain cumulative of gold and silver bearing sediments indicates that the deposition process is a combination pattern between saltation and suspension. The saltation pattern happened at the grain size between -1,5 to 2 phi and suspension pattern 2 - 4 phi. Based on relation curve of the grain size and frequency percentage of the grains indicate the present of a certain grain dominated the depositional process. The most influenced grain size on depositional process are between 0,5 - 2,5 phi that are a medium sand to very fine sand of about 10 - 28%. The depositional pattern of the sediment in the survey area is influenced by the regime of bay current as a combination of the sea and river currents to form the coastal sand sediments. Result of the analysis can become a guidence in gold and silver mining activities in the study area in order to obtain optimal results, that is on sediments with size ranging from medium - very fine sand around the coastline area. Keywords: sediment, gold and silver, depositional process, grain size, Kumai Bay
PENYEBARAN BATUAN GRANIT DAN SEDIMEN KUARTER BERDASARKAN INTERPRETASI DATA SEISMIK DI PERAIRAN BATAM UTARA Ediar Usman
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 1 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i1.275

Abstract

Results of mappings and publications concerning the distribution  of granite and Quaternary sediments in territorial waters of Batam Island and its surroundings are still limited.  It is caused by the distribution of the granite which emerges to sea bottom in territorial waters in the  part of the North  Batam  and its surroundings  is also limited.  Results of seismic interpretation show the existence of some reflector characteristics of the granite and the Quaternary sediments. Based on the interpretation model at bedrock and the Quaternary sediment, distribution area of the bedrock is in part of west and north of Batam Island and also in the part of the north of Bintan Island. While the Quaternary sediment, based on reflector seismic characters, is coarse fluvial deposits at the bottom as the channel fill between some domes of granite body and recent marine deposits at the top. If the bedrock is correlated with regional geology in territorial water of the Batam Island and its surroundings,the bedrock is granite. Keywords: granite, bedrock, Quatenary sedimen,seismic interpretation ,North Batam
SEDIMENTASI SEBAGAI DILEMA PENGEMBANGAN PELABUHAN NUSANTARA DI PERAIRAN LASEM JAWA TENGAH Delyuzar Ilhaude; Ediar Usman
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 3 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i3.286

Abstract

The studied area is geographically located on the northern coast of Jawa, which is an open beach influenced by wave action from the northwest and northeast direction. The erosion process occurs relatively in the northeastern coastline of the Lasem area. Sediment supply from the northeastern of Lasem tends to be deposited in the central and the southwestern part of the studied area. The thickness of sediment of subsequence B4 on line L-1 in the southwestern part of the studied area is thicker compared with subsequense B4 on the line L-17 of the northeastern part of the studied area. The eastern part of Lasem can be developed as a harbor area. Keywords : bearing capacity, sediment supply
PENENTUAN LOKASI SARANA PENGHUBUNG JAWA - BALI (SELAT BALI) SESUAI DENGAN KONDISI OPTIMAL GEOLOGI KELAUTAN Ediar Usman
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 4 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i4.292

Abstract

To decide the preferable location of a bridge or tunnel site connecting Jawa - Bali, marine geological survey on the sea floor of Bali Strait encompassing morphology and geology should be taken into consideration. Depression of 140 meters deep as a result of bathymetrical data recording can be observed. Besides this, the result of reflection seismic record gave a clear interpretation about materials constructing the sea floor, which consists of unconsolidated sediments of coral fragments and sands (such as mounded and slump type). The basement rocks were also found in a narrow basin with cliffs of about 100 to 140 metres deep going north - south direction.  Keywords: marine geology, bathimetry, seismic interpretation, bridge location, Jawa – Bali
PENYEBARAN SEDIMEN MENGANDUNG MINERAL BERAT DI PANTAI DAN PERAIRAN BAGIAN SELATAN BANYUWANGI Ediar Usman
Jurnal Geologi dan Sumberdaya Mineral Vol. 17 No. 5 (2007): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v17i5.307

Abstract

Territorial waters of southern part of Banyuwangi  are located in the southern  slope of Southern  Mountains of Jawa, included  in fore arc basin which is very rich in heavy minerals.   The heavy minerals are the result of volcanic activity along the Southern Mountains of Jawa.  Its products have been transported and deposited along the south coast and sea floor of the Southern Waters of Jawa.Results of analysis of sediments  collected from the coastal area and sea floor in the southtern part of Banyuwangi, indicate high content of heavy mineral especially magnetite.  The heavy minerals which are present within sands are dominated by fine to coarse fractions, i.e.  Sand (S), silty sand (zS), sandy silt (sZ) and gravelly sand (gS).  They are distributed from coastal plain to offshore area. Some samples show that the content of heavy minerals range from 80 to 100% in weight. Rate of Fe content  within magnetite along the sooth part of Banyuwangi  ranges between  6,8 and 30, 6%, whereas that on the sea between 3,3- 27,4%. Result of seismic record interpretation shows that thickness of the sediment containing the heavy minerals is approximately 20 meters from sea floor. Keywords: sea floor sediment, heavy mineral, magnetite, southern part of waters, Banyuwangi
Co-Authors Delyuzar Ilhaude Imelda R.Silalahi